The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistence, but is ultimately converted into true bone and unites the fragments into a single piece.
Undifferentiated plant cells resulting from cell division of differentiated organs, such as leaves, roots, seeds. The undifferentiated callus can be triggered by hormones to develop into a whole plant.
The composite mass of tissue that forms between bone ends when a fracture is healing. Callus is also the mass of tissue that can develop over pressure areas of the feet in people with diabetes who have ischaemia and/or neuropathy
Mass of undifferentiated plant cell s, in divisions, with totipotencity, obtained by in vitro culture or naturally after a wound of tissues or an infection. Whole plants can be regenerated from calluses. Calluses can also be at the origin of cellular suspensions.
A localized firm thickening of the upper layer of skin as a result of repetitive friction. A callus on the skin of the foot has become thick and hard from rubbing (as a result of repetitive friction). Calluses of the feet may lead to other problems such as serious infections. Shoes that fit well can keep calluses from forming on the feet. The hard new bone substance that forms in an area of bone fracture. Bony callus is part of the bone repair process. See the entire definition of Callus
mass of parenchyma cells, that develops from and around wounded plant tissues. It occurs at the conjunction of a graft union, arising from the living cells of the scion and the rootstock. The production and interlocking of these cells constitute one of the important steps in callus bridge formation between the scion and the rootstock in a successful graft.
A small area of skin, usually on the foot, that has become thick and hard from rubbing or pressure. Calluses may lead to other problems such as serious infection. Shoes that fit well can keep calluses from forming. See also: Foot care.
An excessive build up of the hard tough layers of skin. Can be removed at-home or by an esthetician.
In dermatology, a callus (or callous) is an especially toughened area of skin which has become relatively thick and hard as a response to repeated contact or pressure. In botany, the term is also used to announce a condition of thickened surfaces of leaves or other plant parts. Since repeated contact is required, calluses are most often found on hands or feet.
a protruding mass of hardened tissue, often formed after an injury but sometimes a regular feature of the plant, e.g. on the labellum of some orchids and on the axis of the spikelet of some grasses. adj. callose; pl. calli.